Igneous Rock-Today’s Notes
Igneous- Latin for Fire
Form ?- Forms when magma-hot, liquid rock cools and solidifies.
Cools-Cools like water freezing complex mixture – different melting points.
_______Igneous Rocks__________________________________
Extrusive – outside Intrusive- inside
where magma erupting Intrudes on existing rock
Near Volcanoes Coarse grained
cool- quickly Cool Slowly
makes crystals small or no crystals large, visible crystals
these can flow from a volcano Pluton-irregular shaped body
fissure- crack in the earth Batholith- largest area of intrusive rock
called also a vent Stock- smaller then Batholith
example in Hawaii Pu’ u o’o vent. Sill- runs parallel to rock layers
Can flow under water Dike- intrusion cut across existing rock
lava types
1. A’a
2.Pahoehoe-ropy like
3.Pillow Lava